My DD has done similarly in the last week... I think for her she is exhausted. This is her second week of full kinder hours and she's just knackered. One time she didn't even wake up when she wet the bed, we found her wet and had to change the bed with her half asleep and grumpy.

Maybe as she adjusts to being back into school term activities, like preschool etc, she will find her groove again. I'm hoping for the same with my DD.